public class ThreadDemo17 {
    private static int count = 0;
    public static void main(String[] args) throws InterruptedException {
        Object locker = new Object();
        Thread t1 = new Thread(() ->{
            for (int i = 0; i < 500000; i++) {
                synchronized (locker){
                    count++;
                }
            }
        });
        Thread t2 = new Thread(() ->{
            for (int i = 0; i < 500000; i++) {
                synchronized (locker){
                    count++;
                }
            }
        });
        t1.start();
        t2.start();

        t1.join();
        t2.join();

        System.out.println("count= " + count);
    }

}
